EP0520383B1 - Tube de direction pour une bicyclette - Google Patents

Tube de direction pour une bicyclette Download PDF

Info

Publication number
EP0520383B1
EP0520383B1 EP92110583A EP92110583A EP0520383B1 EP 0520383 B1 EP0520383 B1 EP 0520383B1 EP 92110583 A EP92110583 A EP 92110583A EP 92110583 A EP92110583 A EP 92110583A EP 0520383 B1 EP0520383 B1 EP 0520383B1
Authority
EP
European Patent Office
Prior art keywords
inner tube
fork stem
outer tube
headset
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92110583A
Other languages
German (de)
English (en)
Other versions
EP0520383A1 (fr
Inventor
Masashi Nagano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimano Inc
Original Assignee
Shimano Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimano Inc filed Critical Shimano Inc
Publication of EP0520383A1 publication Critical patent/EP0520383A1/fr
Application granted granted Critical
Publication of EP0520383B1 publication Critical patent/EP0520383B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K21/00—Steering devices
    • B62K21/06—Bearings specially adapted for steering heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20732—Handles
    • Y10T74/2078—Handle bars

Definitions

  • the present invention relates to a steering head structure for steerably connecting a front wheel to the body frame of a bicycle.
  • a steering head structure designed not only for a bicycle but for a motorcycle or a motor scooter has a lower bearing device 6 and an upper bearing device 10.
  • the lower bearing device 6 includes a lower inner race 2 fitted on a fork stem 1. a lower outer race 4 fitted in a lower end of a head pipe 3, and balls 5.
  • the upper bearing device 10 includes an upper inner race 7 fitted in an upper end of the head pipe 3, an upper outer race 8 fitted on the fork stem 1, and balls 9.
  • a clamping nut and locknut are screwed to an upper position of the fork stem projecting above the upper outer race.
  • a pressure of contact between the balls and races of the upper and lower bearing devices is determined by a clamping force of the clamping nut. If the clamping force is insufficient, steering control becomes unstable with chattering of the bearing devices, and collisions between balls and races may damage sliding surfaces thereof. If the clamping force is too strong, the steering control becomes heavy, and the balls could inflict indentations on the sliding surfaces of the races to impair a smooth steering control. It is therefore important to fix the clamping nut with a proper tightening torque.
  • the nut In an actual assembly operation, the nut must be tightened while checking if a light steering control may be made without chattering, i.e. taking the ball contact pressure into account. Thus, the operation to assemble the steering head structure is relatively difficult and irksome.
  • Document US-A-4 445 703 discloses a headset for rotatably attaching a fork stem to a head pipe of a frame of a bicycle or the like, comprising: an outer tube coaxially surrounding said fork stem and having bearing means mounted between said fork stem and outer tube for allowing relative rotation about an axis thereof and restricting relative axial movement between said outer tube and said fork stem.
  • the object of the present invention is to provide a steering head structure easy and simple to assemble in an excellent rotatable condition, and particularly to eliminate the trouble of adjusting the ball contact pressure.
  • a headset for rotatably attaching a fork stem to a head pipe of a frame of a bicycle or the like comprising an inner tube fitted on an outer surface of the fork stem, an outer tube coaxially surrounding the inner tube and fitted in an inner surface of the head pipe, and a bearing device mounted between the inner tube and outer tube for allowing relative rotation about an axis thereof and restricting relative axial movement between the inner tube and outer tube, wherein the inner tube, outer tube and bearing device are assembled into an integral unit attachable to and detachable from the head pipe and the fork stem.
  • the outer tube, inner tube and bearing device may be preassembled as a unit in an excellent, rotatable condition free from twisting and chattering.
  • the assembly operation may be carried out within a factory of a component manufacturer, for example.
  • the preassembled unit including the outer tube, inner tube and bearing device may be assembled to the head pipe and fork stem in one effort, with the outer tube fitted on the fork stem, and the inner tube fitted in the head pipe.
  • the unit is assembled in the excellent, rotatable state to the fork stem and head pipe.
  • the fork stem and head pipe are connected in a smoothly rotatable state without twisting and chattering, to realize an ideal steering head structure.
  • Fig: 1 shows a steering head structure for a bicycle.
  • Numeral 1 denotes a tubular fork stem fixedly connected to and supported by a shoulder bracket 11.
  • the shoulder bracket 11 has a pair of right and left fork braces 12 fixed thereto for supporting a front wheel not shown.
  • Numeral 3 denotes a head pipe forming a part of a bicycle frame.
  • Numeral 13 denotes a handle stem.
  • Numeral 14 denotes an inclined cam mounted in the fork stem 1 for engaging the handle stem 13. The inclined cam 14 is radially displaceable by screw drive, to fix the handle stem 13 inside the tubular fork stem 1.
  • Numeral 15 denotes an outer tube fitted in contact with an inner peripheral wall of the head pipe 3.
  • Numeral 16 denotes an inner tube surrounding an outer peripheral wall of the fork stem 1.
  • the outer tube 15 and inner tube 16, together with a ball type bearing device 60, are assembled into an integral unit to constitute a headset 50, in which the two tubes 15 and 16 are rotatable and not axially movable relative to each other.
  • the inner tube 16 includes an inner race section 17 formed at a lower end thereof, while the outer tube 15 includes an outer race section 18 formed at a lower end thereof and opposed to the inner race section 17. Further, an intermediate ring 18a is fitted on an inner peripheral wall of the outer race section 18. A plurality of steering balls 19 are arranged circumferentially at uniform intervals between the intermediate ring 18a and inner race section 17. These components constitute the ball type bearing device 60.
  • the intermediate ring 18a may be omitted by assembling the inner race section 17 and outer race section 18 having suitably selected sizes and shapes and a suitably selected number of balls 19.
  • the intermediate ring 18a and inner race section 17 define ball receiving portions 20 of semicircular section, respectively, for restricting displacement of the steering balls 19 axially of the fork stem 1.
  • the outer race section 18 and inner race section 17, and thus the outer tube 15 and inner tube 16, are assembled into an integral unit acting as the bearing device 60, with the balls 19 fitted in the ball receiving portions 20.
  • Numeral 21 denotes a bush acting as an additional bearing device between upper ends of the outer tube 15 and inner tube 16.
  • the bush 21 may only have a radial position setting function since the above-mentioned bearing device 60 can bear thrust loads acting in opposite directions.
  • the bush 21 may be formed of plastic or the like.
  • Numeral 22 denotes rubber O-rings to act as dust- and water-proofing seals and also to suppress sideways vibrations between the fork stem 1 and head pipe 3.
  • the outer tube 15 has a flange 15a formed at the lower end thereof, and a first locknut 23 screwed to the upper end thereof.
  • the outer tube 15 is attached to the head pipe 3 with the flange 15a and locknut 23 holding the head pipe 3 therebetween.
  • the inner tube 16 has the lower end thereof abutting against the shoulder bracket 11, and is attached to the fork stem 1 by tightening a second locknut 24 screwed to an upper end of the fork stem 1.
  • the outer tube 15 may be drawn downwardly out of the head pipe 3 while the fork stem 1 may be drawn downwardly out of the inner tube 16.
  • the fork stem 1, headset 50 and head pipe 3 may be disassembled quickly.
  • These three components may be assembled quickly by a reverse operation.
  • the conventional ball type steering structure in which the upper and lower bearing devices support numerous balls mounted between the races, as described in the introductory part hereof, has the drawback that the balls could fall inadvertently and be lost when the fork stem and head pipe are disassembled. At a time of assembly, it is necessary to apply grease and arrange the numerous balls circumferentially not to be easily movable on the inner races.
  • the headset While maintaining this state, the fork stem and head pipe are moved relative to each other to a mutually fitting position. Thus, the conventional steering structure requires an extremely irksome operation to change the forks.
  • the headset has the components assembled as a unit in a desired, adjusted state. This headset may simply be assembled with the fork stem 1 and head pipe 3.
  • the fork stem When changing the fork stem, the fork stem may just be removed from the inner tube forming part of the headset, and a new fork stem may be inserted into the inner tube.
  • a new fork stem When changing the bicycle frame, it is only necessary to remove the head pipe from the outer tube and to attach a new head pipe to the outer tube. Further, by replacing the headset itself with one having a different size or diameter, changes in the diameter or other modifications may be made easily to the head pipe and fork stem.
  • Fig. 3 shows a headset in another embodiment of the invention.
  • This headset 150 has a bearing device 160 employing ordinary, commercially available bearing units.
  • bearing units 161 capable of bearing also thrust loads are disposed at the upper end, while a bearing unit 121a is disposed at the lower end for bearing only radial loads.
  • An inner tube 116 includes an upper stepped portion having a radial surface for receiving one end of one of the bearing units 161.
  • a spacer ring 164 is mounted between the two bearing units 161.
  • the bearing units 161 are fixed in place between the inner tube 116 and outer tube 115 by an inner bearing presser ring 162 screwed to the inner tube 116 and an outer bearing presser ring 163 screwed to the outer tube 115.
  • the inner tube 116 further includes a lower stepped portion for receiving the bearing unit 121a.
  • a bearing presser 165 is screwed to the outer tube 115 for fixing the bearing unit 121a in place,
  • the outer tube 115 has a flange 115a formed at the lower end thereof, and a first locknut 123 screwed to the upper end thereof.
  • the outer tube 115 is attached to the head pipe 3 with the flange 115a and locknut 123 holding the head pipe 3 therebetween.
  • the inner tube 116 has a lower end 116a thereof abutting against the shoulder bracket 11, and is attached to the fork stem 1 by tightening a second locknut 124 screwed to an upper end of the fork stem 1.
  • Fig. 4 shows a modification of the headset 150 shown in Fig. 3.
  • the bearing unit 121a is replaced with a plastic bush 121b acting as a slide bearing.
  • the other aspects are basically the same as in Fig. 3.
  • Fig. 5 shows a headset in a further embodiment of the invention.
  • This headset 250 has a bearing device 260 employing two types of balls, i.e. large balls 219a and small balls 219b.
  • an inner tube 216 has a reduced length to surround only a lower region of the fork stem 1.
  • An outer tube 215 also has a reduced length corresponding to the inner tube 216.
  • the inner tube 216 defines, on outer peripheries thereof, a ball receiving surface 216a for receiving the large balls 219a, and a ball receiving surface 216b axially spaced from the surface 216a for receiving the small balls 219b.
  • the outer tube 215 defines, on inner peripheries thereof, a ball receiving surface 215a for receiving the large balls 219a, and a ball receiving surface 215b axially spaced from the surface 215a for receiving the small balls 219b.
  • the ball receiving surfaces 215a and 216a are opposed to each other, and the ball receiving surfaces 215b and 216b are also opposed to each other. As seen from Fig.
  • the balls and the ball receiving surfaces are shaped to allow the bearing device 260 to bear both thrust load and radial load.
  • the outer tube 215 includes a flange extending radially for defining the ball receiving surface 215a. This flange is used to attach the headset 250 to the head pipe 3.
  • a spacer pipe 240 is disposed to abut on an upper end surface of the inner tube 216 and surround the fork stem 1.
  • the spacer pipe 240 is pressed downwardly by a locknut 223 screwed to the upper end of the fork stem 1, thereby to secure the inner tube 216 to the fork stem 1.
  • a flanged bush is mounted between the locknut 223 and the upper end of the fork stem 1 to act as a slide bearing. This bush determines a radial space between the fork stem 1 and head pipe 3 while allowing relative rotation therebetween.
  • the spacer pipe 240 and inner tube 216 may be interconnected through screws.
  • Fig. 6 shows a modification of the headset 250 shown in Fig. 5.
  • a headset 350 in this modification differs from the headset 250 in Fig. 5 in that the positions of the large balls 219a and small balls 219b are reversed. Accordingly, the positions of the ball receiving surfaces 215a and 215b formed on the outer tube 215 and the positions of the ball receiving surfaces 216a and 216b formed on the inner tube 216 are also reversed.
  • the embodiment shown in Fig. 1 has the advantages of simplified construction and low manufacturing cost in that the steering balls 19 are arranged circumferentially of only one position with respect to the axial direction of the headset.
  • balls are used in the bearings in all of the described embodiments and modifications, it is possible within the scope of the present invention to use only bushes instead of using the balls.
  • Caulking, lock pins or other devices may be used in place of the locknuts for axially immovably fixing the outer tube and inner tube to the head pipe 3 or fork stem 1.

Claims (6)

  1. Tube de direction destiné à fixer de façon rotative une tige de fourche (1) au tube de tête (3) d'un cadre de bicyclette ou analogue, comportant:
       un tube interne (16) adapté sur la surface externe de ladite tige de fourche (1);
       un tube externe (15) entourant de façon coaxiale ledit tube interne (16) et adapté dans la surface interne dudit tube de tête (3); et
       un moyen de palier (19) monté entre ledit tube interne (16) et ledit tube externe (15), pour permettre la rotation relative autour de l'axe de ceux-ci, et un mouvement axial relatif restreint entre ledit tube interne (16) et ledit tube externe (15);
       dans lequel ledit tube interne (16), ledit tube externe (15) et ledit moyen de palier (19) sont assemblés en un ensemble intégral pouvant être fixé et démonté dudit tube de tête (3) et de ladite tige de fourche (1).
  2. Tube de direction selon la revendication 1, dans lequel ledit moyen de palier (19) est formé par un roulement à billes monté entre ledit tube interne (16) et ledit tube externe (15), et peut soutenir des charges de poussée et des charges radiales.
  3. Tube de direction selon la revendication 2, comportant en outre un moyen de palier supplémentaire formé par un roulement à billes radial, pour permettre une rotation relative entre ledit tube de tête (3) et ladite tige de fourche (1).
  4. Tube de direction selon la revendication 3, dans lequel ledit moyen de roulement à billes radial est monté entre ledit tube interne (16) et ledit tube externe (15).
  5. Tube de direction selon la revendication 2, comportant en outre un moyen de palier supplémentaire formé par un palier coulissant, pour permettre une rotation relative entre ledit tube de tête (3) et ladite tige de fourche (1).
  6. Tube de direction selon la revendication 5, dans lequel ledit palier coulissant est monté entre ledit tube interne (16) et ledit tube externe (15).
EP92110583A 1991-06-25 1992-06-23 Tube de direction pour une bicyclette Expired - Lifetime EP0520383B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15290191 1991-06-25
JP152901/91 1991-06-25

Publications (2)

Publication Number Publication Date
EP0520383A1 EP0520383A1 (fr) 1992-12-30
EP0520383B1 true EP0520383B1 (fr) 1995-02-22

Family

ID=15550614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92110583A Expired - Lifetime EP0520383B1 (fr) 1991-06-25 1992-06-23 Tube de direction pour une bicyclette

Country Status (3)

Country Link
US (1) US5272936A (fr)
EP (1) EP0520383B1 (fr)
DE (1) DE69201464T2 (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19522623A1 (de) * 1995-06-22 1997-01-02 Dietrich Gerhard Ellsaeser Steuerkopfpatronenlager für Fahrräder
USD410869S (en) * 1997-02-12 1999-06-15 Darren Singer Bicycle headset cap
DE29901449U1 (de) 1999-01-28 1999-04-22 Kettler Heinz Gmbh Fahrzeug-Lenkkopf
CA2303687C (fr) * 1999-07-05 2005-02-08 Heinz Kettler Gmbh & Co. Raccord de direction de vehicule
US6302589B1 (en) * 1999-12-22 2001-10-16 Philippe Van Houtte Steering bearing assembly for wheeled vehicle
US20030146595A1 (en) * 2002-02-04 2003-08-07 Cane Creek Cycling Components, Inc. Bicycle headset construction
US6698781B1 (en) * 2002-05-31 2004-03-02 Pacific Cycle Llc Simplified stem-to-yoke mounting assembly cycle
US20050092127A1 (en) * 2003-10-30 2005-05-05 Douglas Chiang Combination of bicycle headset assembly and head tube
US7396032B2 (en) * 2003-11-07 2008-07-08 Shimano Inc. Bicycle headset structure
GB2413996A (en) * 2004-05-15 2005-11-16 Lloyd Townsend Steering bearing assembly
JP2006076510A (ja) * 2004-09-13 2006-03-23 Shimano Inc 自転車用ヘッド部品
US7520520B2 (en) * 2006-03-08 2009-04-21 Specialized Bicycle Components, Inc. Bicycle fork assembly
DE102008011374A1 (de) * 2008-02-27 2009-09-03 Bayerische Motoren Werke Aktiengesellschaft Lenkkopflager bzw. Motorrad mit einem Lenkkopflager
FR2954266B1 (fr) 2009-12-21 2011-12-23 Look Cycle Int Jeu de direction de cycle a goupille et cycle comportant un tel jeu de direction
IT1397865B1 (it) * 2009-12-23 2013-02-04 Innocenti Dispositivo di registrazione per serie sterzo di bicicletta.
ES1089834Y (es) * 2013-07-08 2013-12-13 Batec Mobility S L Dispositivo de seguridad para un elemento auxiliar de silla de ruedas
ES2425316B1 (es) * 2013-07-08 2014-08-05 Batec Mobility, S.L. Sistema auxiliar de movilidad para silla de ruedas
EP2987711A1 (fr) * 2014-08-22 2016-02-24 Larry VS Harry ApS Tube de tête pour une bicyclette
DE102017010334B4 (de) * 2017-11-08 2019-06-27 Convert Gmbh Befestigungsanordnung zum Befestigen eines Steuersatzes an einem Steuerrohr eines Fahrrads
DE102018107875A1 (de) * 2018-04-04 2019-10-10 Schaeffler Technologies AG & Co. KG Tandem-Schrägkugellager
USD1015969S1 (en) 2021-08-31 2024-02-27 Daniel J. McAllister Anchor pin for motorcycle steering spindle assembly
US11815112B1 (en) * 2021-08-31 2023-11-14 Daniel J. McAllister Anchor pin for motorcycle steering spindle assembly

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Also Published As

Publication number Publication date
US5272936A (en) 1993-12-28
DE69201464D1 (de) 1995-03-30
DE69201464T2 (de) 1995-06-14
EP0520383A1 (fr) 1992-12-30

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